Arch brick



C. E. MILLER.

ARCH BRICK.

FILED SEPTA. 1921.

Dec. 19, 1922.

Patented Dec. 19, 1922.

. UNITED STATES CHARLES E. MILLER, OF CHICAGO, ILLINOIS, ASSIGNOR T0 UNIVERSAL ARCH COMPANY,

I 1,439,632 PATENT OFFICE.

OFCHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

ARCH BRICK.

Application filed September in connection with the usual slag formation on the lower surface of such arches.

It has been foundin practice that wherever the coal utilized contains an excessive amount of iron and sulphur, a relatively large amount of slag is formed which ad heres to the lower surface of the transverse arch. In the form of bricks heretofore em ployed, particularly those bricks of arcuate form, the liquid slag which is carried upward by the stream of combustion products and deposited on the lower surface of the arch, tends to run down and accumulate at the ends of the bricks adjacent to the arch tubes which support the arch.

The particular object of my invention is to provide a brick having a lower surface'so designed that the low point of the brick is spaced away from the arch tube. In this manner the slag is diverted from the arch tube and will drop off into the fire at such low point. \Vhatever quantity adheres to the brick will be at a distance from the arch tube and may be easily removed with less danger of breaking the brick. Furthermore, by lessening the accumulation of slag on and around the arch tubes. the bricks may be more readily removed as required at intervals for inspection and repair of stay bolts and the cleaning of fiues.

The desired result is secured by providing a brick havingan arcuate under surface, the ends of the arc terminating at a point materially removed from the arch tube, the surface of the brick separating the end of the are from the tube being upwardly inclined and terminating short of the tube. Thus the end of the arc of curvature is at the lowest point of the brick and may also be coincident with the end oh the recess formed in the bricks on their lower surfaces.

The invention will be more readily understood by reference to the accompanying drawings, wherein,

Fig. 1 is an edge view of an intermediate 1, 1921. Serial No. 497,637.

arch brick constructed in accordance with my invention, the arch tubes being shown in section, and,

Fig. 2 is a bottom plan view thereof with the arch tubes omitted. t, In the drawings it will be seen that I have shown two arch tubes 10, which may form a' part'of a series thereof mounted in a fire box and serving to support an arch, one of the immediate bricks of which is here illustrated. It will be understood that the arch is made up of a plurality of such bricks, but as all of the intermediate bricks are duplicates, but one thereof is shown.

The brick in this instance is shown to be of arcuate form and comprises a body portion 11, having its upper surfaces 12, 13, formed by arcs having different radii. The lower surface 14 is for-med by an arc of a single radius. Thus it will be seen that the depth of the brick at the center is greater. than its depth. at the sides, thereby providing for a greater body of refractory material at the center where the greatest wear ocours.

It will be noted that the surface 14: terminates at the points 15, and that the lower surface is completed by the divergent surfaces 16, which extend upwardly from a horizontal line coincident with the points 15. The surfaces 16 merge with arcs 17 of greater radius than the radius of the tubes 10, whereby the ends 18 of the bricks rest upon the tops of the tubes 10, a substantial space separating the surface 17 from the sides of the tubes. The bricks may be provided with recesses 19 having diagonal downwardly projecting upper walls 20, which terminate at or near to the points 15, which are the lowest points of the brick. Thus it will be seen that slag deposits either in the recesses or on the lower surfaces will tend to run to the lowest point 15 and there accumulate and drop oif. Such of the slag as accumulates and hardens at this point is separated a considerable distance from the tubes and may readily be dislodged as re quired. Furthermore; the accumulations will not interfere with the removal of the bricks as required at intervals for inspection and repair of stay bolts.

A similar advantageous result may be secured even though the bricks are of the flat type commonly employed, a similar contour of the under surface of such bricks being utilized to provide a low point adjacent to but removed from the arch tube. The same result accrues also Whether or not the bricks are provided with recesses on their under surface. I do not therefore wish to be limited except as indicated in the appended claims.

I claim:

1. An arch brick having an arcuate lower surface, the ends of the arc terminating at a point materially removed from the ends of the brick, a curved groove at the ends of the brick for engagement with an arch tube, and an upwardly extending surface connecting the ends of the arc with the arch tube grooves.

2'. An arch brick comprising a body portion having grooved ends for engagement with an arch tube, a curved lower surface and an upwardly extending surface extending from the ends of the curved portion to the grooved portion.

3. An arch brick having grooved ends'for engagement with an arch tube, and having an arcuate lower surface terminating at a point removed from the grooves, the space separating said curved portion from said grooves extending upward, said brick having recesses the outside terminal point of which is substantially coincident with the end of the arcuate port-ion.

Signed at Chicago, 111., this 29th day of August, 1921.

' CHARLES E. MILLER. 

